An overlay is a kind of silk screen printed or digital printed
graphic sheet or panel that is placed on the surface of a product.
Graphic overlays provide a high quality finish for products,
communicate messages, and act as the interface between people and
products. It can be made in many different ways, depending on the
specifications of the application.

A wide variety of graphic effects can be printed on different
materials. The underside usually is covered with an adhesive layer
backed with a liner. During assembly the liner is removed so the
graphic can be pressed onto the surface of the product. Overlays
can be thick or thin, depending on the desired look. They can be
just a few colors or they can be photographic in appearance.